Allow comments in extension config files.

chrome/common/extensions/api/debugger.json

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 [
   {
     "namespace": "debugger",
     "types": [
       {
         "id": "Debuggee",
         "type": "object",
         "description": "Debuggee identifier.",
         "properties": {
           "tabId": { "type": "integer", "description": "The id of the tab which you intend to debug." }
@@ skipping 117 matching lines @@
           {
             "$ref": "Debuggee",
             "name": "source",
             "description": "The debuggee that was detached."
           }
         ]
       }
     ]
   }
 ]